Steam-engine



(No Model.) 5 2 Sheets-Sheet 1.

s. E; JARVIS. STEAM ENGINE.

A No. 275,389. Patented Apr. 10,1883.

1y, I. 07 17V! INVENTOR fi7 jw wonmvs (No Model.) 2 Sheets-Sheet 2. S. E. JARVIS.

STEAM ENGINE. No. 275.389. Patented Apr,,.10.

N. PETERS. Pholo-Llthoqnphon m-mnm n. c.

UNITED STATES ATENT @FFICE.

SAMUEL E. JARVIS, OF LANSING, MICHIGAN/ STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 275,389, dated April 10, 1883,

(No model.)

To all whom it may concern Be it known that I, SAMUEL E. Jnnvrs, of Lansing, in the county of Ingham and State of Michigan, have invented certain new and uselul Improvements in Steam-Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertainsto make and use it, reference being bad to the accompanying drawings,which form part of this specification.

My invention relates to steam-engines; and it consists in the peculiar construction of the same, as will be hereinafter fully set forth and claimed.

In the drawings, Figure l is a side elevation in section, and Fig. 2 is a front elevation in section, of my machine.

A and B are two cylinders,which are placed at an angle to each other, and in such a manner that their centers are on a line with the center of the crank-shaft (J, and also on a line respectively with the cranks D and E. The cylinders A and B are each provided with a piston, F and G. These pistons are made in the form of trunk pistons and provided with suitable packing-rings. In the opposite sides of the piston F, I form two deep recesses, H and B, through the centers of which ahole is bored for the passage of a bolt or pin, I,whereby the connecting-rod J is pivoted in the said piston. Directlyabovetherecesses,andextendin g across the interior of the piston, is a bracebar, K, the object of which is to prevent the said piston from being flattened or sprung by the drawing up of the nuts or keys used to fasten the pin or bolt I in the piston. The piston G is also formed and secured to the conmeeting-rod L in the same manner as the piston F, above described.

Secured to and covering the upper ends of both cylinders A and B is a steam-chest, M, which is provided with an inlet-port,'a, and

supply-ports b and c, and also an exhaust-port,

d, leading to the exhaust N, formed between the cylinders A and B. The steam-chestMis also provided with a valve, 0, so constructed as to allow of steam being alternately fed to and exhausted from the upper ends of the cylinders A and B.

The valve shown in the drawings is whatis known as a rocking valve, and its construction will be easily understood without any further description by reference to said drawings.

The operation of my engine is as follows: Steam is admitted through the inlet-port a to the interior of the steam-chest. We will now suppose the valve 0 to be in such a position as. to allow steam to pass into the port b and from thence to the cylinder B. This position of the valve 0 will open communication between the port 0 and port at and allow steam to escape from the cylinder A to the exhaust N. The piston F is driven downward,which, being con: nected by means of aconnecting-rod, J, to the crank D, acts to revolve the shaft 0, and the cranks D and E being diametrically opposite, the other connecting-rod, L, is forced upward, and with itthe piston G, to which it is attached. Meanwhile the shaft 0 has made a half-revolution, and the valve 0, by means of suitable mechanism, has been reversed, which allows the steam from the steam-chest to be fed to the cylinder A and exhausted from the cylinder B, and thus the piston G is driven down and the piston Fis carried upward. This actionis continued as long as steam is fed to the steam chest and cylinder.

It is obvious that the above-described construction will operate equally as well in a horizontal engine as in an upright or vertical engine, as shown. 7

I do not wish to limit myself to the kind of valve employed, as I am aware thatother kinds beside the one shown can be used, it only being necessary to so construct and connect it to the engine thatit will feed steam to one cylinder and exhaust it from the other alternately, thus acting to operate two cylinders by means of one valve, substantiallyas described.

It will be seen that by setting the cylinders A and B at an angle to each other, as above described, there is no dead-point, and that the working parts of the engine will practically balance each other, and thus a steadier motion and a much higher speed are obtained.

\Vhat I claim is- 1. In a steam-engine, the combination, with two steam-cylinders placed at an angle to each other, of ajacket surrounding both cylinders, a single valve for governing the admission of steam to the cylinders and for directingthe exhaust-steam into a chamber between the cylinders, substantially as set forth.

2. In a steam-engine, two cylinders set at an angle to each other and provided at or near 5 their tops or ends with a steam -chest, said steam-chest having its exhaust-port leading directlyinto an exhaust-chamber formed between the said cylinders, substantially as shown and described.

In testimony whereofI have signed my name 10 to this specification in the presence of two subscribing witnesses.

SAMUEL E. JARVIS.

Witnesses:

CHARLES F. H AMDIOND, WILLIAM H. MULLIGAN. 

